Pressure control head for pumps



United States Patent ice 2,722,370 Patented Nov. 1, 1955 PRESSURE CONTROL HEAD FOR PUMPS Peter Owsen, Dearborn, and Paul J. Owsen, Allen Park, Mich.

Application October 4, 1954, Serial No. 459,902

4 Claims. (Cl. 230-2) Our invention relates to a new and useful improvement in a pressure control nozzle adapted for use on pneumatic structures and particularly those of a pump type.

It is an object of the present invention to provide a control nozzle whereby, upon building up a certain pressure, air delivered through the nozzle may be deflected to the exterior.

Another object of the invention is the provision of a simple and effective means for adjusting the mechanism to various pressures.

Another object of the invention is the provision of an air pump having an outlet nozzle so arranged and con structed that the air will be delivered to the delivery housing until a predetermined pressure has been built up whereby it will be delivered to the atmosphere.

Other objects will appear hereinafter.

It is recognized that various modifications and changes may be made in the detail of structure illustrated without departing from the invention and it is intended that the present disclosure shall be considered to be but the preferred embodiment.

Forming a part of this application are drawings in which,

Fig. 1 is a longitudinal central sectional view of the invention;

Fig. 2 is an elevational view of the invention with a part broken away;

Fig. 3 is a sectional view taken on line 33 of Fig. 1;

Fig. 4 is an elevational view of a diaphragm used in the invention;

Fig. 5 is a slightly enlarged fragmentary sectional view through the outlet end of the structure.

As shown in the drawings, the invention comprises a barrel 9 having a cap 10 on one end provided with bleed openings 11, the interior 12 of this barrel serving as a cylinder for the plunger or cup washer 13 which is mounted on the end of the reciprocating rod 14 having a hand holder knob 14a on its upper end. The structure is such that when the operator is holding the barrel 9 in his hand, the suction cup 13 may be reciprocated within the cylinder 12.

The barrel 9 is closed at one end by the end wall 15 having the sealing gasket or ring 16 therearound. Threaded on the closed end of the barrel 9 is a cup 17, having the central opening 29a formed in its bottom 28 and provided on its inner face with a shoulder 22 against which may engage a diaphragm 33 which is glued or otherwise secured along its marginal edges to one face of a rigid washer 24. The diaphragm is made from suitable flexible material such as rubber or the like. The washer or disc 24 has a central opening 25 formed therein. This disc 24 is normally maintained in spaced relation to the end wall 15 by means of a spring 26 interposed between the disc 24 and the end wall 15. Formed in the end wall 15 is an opening 27. Formed in the diaphragm 33 are the diametrically oppositely disposed slots 23.

Formed in the bottom 28 of the cup-shaped member 17 are openings or passages 32 and a central opening 291:. Secured in communication with the central opening 29a is a flexible conduit 29 carrying at its end a tube 30 having openings 31 formed therein and provided with a rotatable sleeve 30a which may be screwed on to a suitable air valve.

The construction is such that upon reciprocation of the member 14 air will be forced through the passage 27 and through the passage 25 so as to bulge the diaphragm 33 into the position shown in Fig. 5. When in this position, air may pass through the slots 23 and through the opening 29a. It will be noted that while in this position the passages 32 are closed by the diaphragm 33, the spring 26 normally holding this diaphragm in engagement with the shoulder 22 formed on the inner face of the end wall 28. Should the pressure in the conduit 29 be built up to a predetermined .force during the pressure stroke of member 14, then during the succeeding suction stroke of member 14, namely, movement of member 14 to the left as viewed in Fig. 1, the disc 24 would be forced to the left of Fig. 1 against the compression of the spring 26 and air over and above the predetermined amount delivered through the opening 25 would pass through the passages 32 into the atmosphere the aforementioned predetermined force or pressure in conduit 29 is governed by the tension of spring 26.

The tension of the spring 26 may be adjusted by rotating the sleeve 17 on the barrel 9. This sleeve 17 carries a projection 18 against which is adapted to engage a plunger 19 projecting outwardly from the housing 20 which is mounted on the barrel 9. A spring 21 positioned within this housing 20 serves to normally retain the plunger 19 positioned outwardly. This projection 18 would serve to prevent reverse rotation of the sleeve 17 on the barrel 9.

An examination of Fig. 2 would indicate that when the sleeve 17 is rotated one rotation it would be necessary to force the plunger 19 inwardly of the housing 20 before further rotation of the sleeve 17 could be effected. This may be accomplished by any suitable object used for forcing the plunger 19 inwardly of the housing 20.

Suitable graduations may be displayed on the barrel 9 if desired to indicate the pressure at which the spring 26 will be compressed to allow the air to escape to the atmosphere. In this way we have provided a simple and effective means of inflating a pneumatic inflatable object to any predetermined pressure and adjusting the inflating mechanism to various pressures when desired.

What we claim is:

1. In a device of the class described, a cylinder forming barrel; a plunger slidably mounted in said barrel; an end wall on one end of said barrel and having a passage formed therethrough for permitting the escape of air from said barrel upon reciprocation of said plunger; a sleeve threaded on said closed end of said barrel; an end wall on said sleeve having a central opening formed therein and provided, outwardly of said central opening, with outlet passages; a flexible conduit communicating at one end with said central opening; a rigid disc mounted in said sleeve and having a central opening formed therethrough and normally spaced from the closed end of said barrel; a spring positioned between the closed end of said barrel and said disc for normally retaining said disc in spaced relation to the end of said barrel and adjustable as to tension upon threading of said sleeve on said barrel; a flexible diaphragm mounted on one face of said disc along its marginal edges and provided inwardly thereof with passages therethrough spaced radially outwardly from the central opening in said disc and normally engaging a shoulder on the end of said sleeve and overlying and closing the outlet openings formed in the end of said sleeve and flexible upon forcing of air through the central opening in said disc away from the surface of said disc for permitting air to pass through the openings in said diaphragm to said central opening of said end wall.

2. In a device of the class described, a cylinder forming barrel closed at one end and having a central opening formed through said closed end; a sleeve threaded on said closed end; an end wall on said sleeve having a central opening formed therethrough and provided, outwardly of said central opening, with outlet passages; a shoulder formed on the inner surface of said end wall; a rigid disc positioned in said sleeve normally spaced from the closed end of said barrel; a spring positioned between said disc and the closed end of said barrel for normally retaining said disc in spaced relation thereto, said disc having a central opening formed therein; a flexible diaphragm secured along its marginal edges to one face of said disc and overlying the central opening in said disc and provided outwardly of said central opening of said disc with passages therethrough, said diaphragm engaging said shoulder and normally closing the passages through the end wall of said sleeve; a plunger in said barrel for, upon reciprocation therein, forcing air through the central opening in the closed end of said barrel and through the central opening in said disc, said diaphragm, upon air being forced through the central opening in said disc, flexing for permitting air to pass through the passages in said disc to the central opening formed in the end wall of said sleeve, saiddisc and said diaphragm being movable against the compression of said spring for uncovering the outwardly positioned passages in the end wall of said sleeve upon developing of a certain back pressure against said diaphragm.

3. A device of the class described, comprising: a cylinder forming barrel; a closure for one end of said barrel having a central opening formed therethrough; a Spring rotatably mounted in said barrel and movable longitudinally thereof for forcing air through the central opening in said closure; a cup-shaped sleeve threaded on the closed end of said barrel and having a central opening formed in its bottom and passages formed through said bottom outwardly of said central opening; a conduit communicating with the central opening in the bottom of said sleeve; a shoulder formed in the inner surface in the bottom of said sleeve; a rigid disc mounted within said sleeve and having a central opening formed therethrough; a spring positioned between the closure of said barrel and said disc for normally retaining the same in spaced relation, the threading of said sleeve on to said barrel effecting a tension on said spring for required tension thereof; a flexible diaphragm secured on one face of said disc adjacent the marginal edges thereof and normally overlying the passages formed through the bottom of said cup-shaped sleeve and having, outwardly of the central opening through said disc, openings formed therethrough and flexible, upon air under pressure passing through the opening in said disc, for establishing communication between the central opening in said disc and the openings through said diaphragm.

4. A device of the class described, comprising: a cylinder forming barrel; a closure for one end of said barrel having a central opening formed therethrough; a plunger rotatably mounted in said barrel and movable longitudinally thereof for forcing air through the central opening in said closure; a cup-shaped sleeve threaded on the closed end of said barrel and having a central opening formed in its bottom and passages formed through said bottom outwardly of said central opening; a conduit communicating with the central opening in the bottom of said sleeve; a shoulder formed in the inner surface in the bottom of said sleeve; a rigid disc mounted within said sleeve and having a central opening formed therethrough; a spring positioned between the closure of said barrel and said disc for normally retaining the same in spaced relation, the threading of said sleeve on to said barrel eifecting a tension on said spring for required tension thereof; a flexible diaphragm secured on one face of said disc adjacent the marginal edges thereof and normally overlying the passages formed through the bottom of said cup-shaped sleeve and having, outwardly of the central opening through said disc, openings formed therethrough and flexible, upon air under pressure passing through the opening in said disc, for establishing communication between the central opening in said disc and the openings through said diaphragm; said disc and said diaphragm being movable against the compression of said spring on said shoulders for uncovering the passages through the bottom of the cup-shaped sleeve upon development in said conduit of a predetermined air pressure.

References Cited in the file of this patent UNITED STATES PATENTS 909,373 Desmond Jan. 12, 1909 1,396,494 Wright Nov. 8, 1921 1,455,646 Millard May 15, 1923 2,186,623 Brandt Jan. 9, 1940 FOREIGN PATENTS 351,484 Germany Apr. 8, 1.922

1,026,361 France Apr. 27, 1953 

